Frames I love frames and look for them in nature and in the manmade world. Using them to create depth and add interest. We make images using the frame of our viewfinder or display and then when we view the image we see the same frame. Adding another frame inside the image border is a very cool way to make your pictures pop. 

Shooting with frames creates a sense of 3d - using the foreground and background 

Hampton Court Frames 

Architects create frames deliberately to show off their buildings. Gardeners do the same. Hampton Court is ALL frames 

Holiday frames in Greece 

Tips 
1. Decide if you are focusing on the frame or the view though the frame 
2. Experiment with viewpoint 
3. You may need to adjust exposure if the frame is very dark. Use exposure compensation.